slapos_accounting: do not block non automated Sale Invoices

master/bt5/slapos_accounting/SkinTemplateItem/portal_skins/slapos_accounting/SaleInvoiceTransaction_isTotalPriceMatchingSalePackingList.py

 invoice = context
 if invoice.getLedger() != 'automated':
-  return False
+  # Non automated invoices can be used
+  return True
 
 delivery_list = invoice.getCausalityValueList(portal_type='Sale Packing List')
 amount = len(delivery_list)

master/bt5/slapos_accounting/SkinTemplateItem/portal_skins/slapos_accounting/SaleInvoiceTransaction_isTradeModelCorrect.py

+if context.getLedger() != 'automated':
+  # Non automated invoices can be used
+  return True
+
 specialise = context.getSpecialiseValue(portal_type='Sale Trade Condition')
 if specialise is None or specialise.getSpecialiseValue() is None:
   # The trade model don't applies if the Trade Condition isn't attached to 

master/bt5/slapos_accounting/TestTemplateItem/portal_components/test.erp5.testSlapOSAccountingConstraint.py

@@ -218,6 +218,7 @@ class TestSaleInvoiceTransaction(TestSlapOSConstraintMixin):
     invoice = self.portal.accounting_module.newContent(
         portal_type='Sale Invoice Transaction',
         price_currency_value=currency,
+        ledger='automated',
         specialise_value=sale_trade_condition)
     invoice.newContent(portal_type='Invoice Line', quantity=1., price=1.,
         base_contribution='base_amount/invoicing/taxable')